Department of Civil Engineering, IIT Delhi

New Findings

Recent work done by Dr. Suresh Bhalla. Details can be obtained from following publication :

"Moti Baba has just completed a Mini Project under the guidance of Dr Suresh Bhalla entitled “Shed Type Structures: Steel Vs Bamboo". The project attempted to make use of the scientific methodology developed by Dr. Bhalla for the design of bamboo structures for optimization studies.

Nikhil Vyas has just completed a Mini Project under the guidance of Dr Suresh Bhalla entitled “Bamboo Based Poultry Shed”. As a part of the project, a new type of dismountable poultry structure has been proposed based on the idea of tensegrity structures.

Bhalla, S., Gupta, S., Sudhakar, P. and Suresh, R. (2008),
" BAMBOO AS GREEN ALTERNATIVE TO CONCRETE AND STEEL FOR MODERN STRUCTURES ",
International Congress of Environmental Research, Goa, 18-20 December 2008

(a) Front elevation. (b) Side elevation.

Fig. 1 Details of typical industrial shed aimed to be replaced with bamboo.

Fig. 2 Analysis of transverse frame for wind normal to ridge, inside pressure.

S.No.	WIND CASE	TENSILE FORCE(kN)	MOMENT(kNm)	HORIZANTAL FORCE(kN)
1	Wind normal to ridge, inside suction	3.2	74.5	39.8
2	Wind normal to ridge, inside pressure	53	70.5	36.5
3	Wind along ridge, inside suction	0	4.2	4.2
4	Wind normal along ridge, inside pressure	46.3	4.2	4.2

Table 1 : Summary of force at bottom of column for four wind conditions.


(a). Arch and tie element.	(b). Columns.

(c). Vertical and bottom chord bracing.	(d). Purlins.
Fig. 3 Cross section of various components worked out by design principles.

DESIGN OF BAMBOO TIED ARCH

Fig. 4 shows the idealized model of the bamboo tied arch. The arch is assumed to follow a parabolic profile as given by :

whereH is the crown height and L the span of the arch. In general, under a uniformly distributed load w (acting downwards), the force in the arch (Fa) and the tie element (Ft) can be derived, using equilibrium of forces, as

(Compressive)(2)

(Tensile)(3)

Table 2 summarizes the maximum forces induced in the tie and the arch components under the load combinations DEAD LOADS + LIVE LOADS and DEAD LOADS + WIND LOADS. Wind case 2 (Table 1), which offers the maximum upward load on the arch element has been considered in the above combinations.

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ADVANTAGES OF BAMBOO

Competitive strength to mass ratio.

Drawback is susceptibility to termite attack.

Suitable for treatment.